This is Part 1 of the Radiology
Fundamentals 5th Edition
Comprehensive Test Bank by Herring.
FONT DIRECTIVE: Times New Roman, Font Size 14 (apply to all text when exporting to Word/PDF)
TABLE OF CONTENTS - PART 1 of 5
Chapter 1: Imaging Physics and Radiation Safety (Questions 1-25)
Chapter 2: Chest Radiology (Questions 26-50)
Chapter 3: Abdominal Radiology (Questions 51-75)
Chapter 4: Musculoskeletal Radiology (Questions 76-100)
CHAPTER 1: IMAGING PHYSICS AND RADIATION SAFETY
Q1. A 45-year-old man is scheduled for a computed tomography scan of the abdomen. Which of the
following best describes the primary physical principle underlying CT image formation?
A. Attenuation of x-rays by tissues
B. Reflection of sound waves
C. Precession of hydrogen protons
D. Emission of positrons
Correct Answer: Attenuation of x-rays by tissues (A) ✓
Rationale: Computed tomography uses x-rays that are attenuated to varying degrees as they
pass through tissues, and the transmitted x-rays are detected to reconstruct cross-sectional images.
Reflection of sound waves describes ultrasound, precession of hydrogen protons describes magnetic
resonance imaging, and emission of positrons describes positron emission tomography. The degree
of x-ray attenuation depends on tissue density and atomic number, which is the basis of CT image
contrast.
Q2. A 30-year-old woman is undergoing an magnetic resonance imaging of the brain. Which of the
following best describes the primary physical principle underlying MR image formation?
,A. Attenuation of x-rays
B. Precession of hydrogen protons in a magnetic field
C. Reflection of sound waves
D. Emission of gamma rays
Correct Answer: Precession of hydrogen protons in a magnetic field (B) ✓
Rationale: Magnetic resonance imaging relies on the behavior of hydrogen protons, which
precess in a strong magnetic field and emit radiofrequency signals when perturbed by a
radiofrequency pulse. Attenuation of x-rays describes radiography and CT, reflection of sound waves
describes ultrasound, and emission of gamma rays describes nuclear medicine. The signal intensity
depends on proton density and tissue relaxation properties, which generate image contrast.
Q3. A 55-year-old man is undergoing an ultrasound of the abdomen. Which of the following best
describes the primary physical principle underlying ultrasound image formation?
A. Attenuation of x-rays
B. Precession of hydrogen protons
C. Reflection of sound waves at tissue interfaces
D. Emission of positrons
Correct Answer: Reflection of sound waves at tissue interfaces (C) ✓
Rationale: Ultrasound imaging uses high-frequency sound waves that are reflected at
interfaces between tissues with different acoustic impedances, and the returning echoes are used to
generate images. Attenuation of x-rays describes radiography and CT, precession of hydrogen protons
describes MRI, and emission of positrons describes PET. The frequency of the transducer determines
resolution and penetration depth.
Q4. A 40-year-old woman is undergoing a positron emission tomography scan. Which of the
following best describes the primary physical principle underlying PET image formation?
A. Attenuation of x-rays
B. Precession of hydrogen protons
C. Reflection of sound waves
D. Detection of annihilation photons from positron emission
Correct Answer: Detection of annihilation photons from positron emission (D) ✓
Rationale: Positron emission tomography uses radiotracers that emit positrons, which
annihilate with electrons to produce two 511 keV photons emitted in opposite directions, and these
photons are detected to create images. Attenuation of x-rays describes radiography and CT,
,precession of hydrogen protons describes MRI, and reflection of sound waves describes ultrasound.
PET is used to assess metabolic activity, commonly with fluorodeoxyglucose.
Q5. A 50-year-old man is undergoing a radiograph of the chest. Which of the following best describes
the primary physical principle underlying radiographic image formation?
A. Differential attenuation of x-rays by tissues
B. Precession of hydrogen protons
C. Reflection of sound waves
D. Detection of annihilation photons
Correct Answer: Differential attenuation of x-rays by tissues (A) ✓
Rationale: Radiography uses x-rays that are differentially attenuated as they pass through
tissues, and the transmitted x-rays expose a detector to create a two-dimensional image. Precession
of hydrogen protons describes MRI, reflection of sound waves describes ultrasound, and detection of
annihilation photons describes PET. Dense structures such as bone attenuate more x-rays and appear
white, while air attenuates few and appears black.
Q6. A 35-year-old woman is concerned about radiation exposure from a chest radiograph. Which of
the following best describes the effective dose of a standard chest radiograph?
A. 0.01 mSv
B. 0.1 mSv
C. 1 mSv
D. 10 mSv
Correct Answer: 0.1 mSv (B) ✓
Rationale: The effective dose of a standard chest radiograph is approximately 0.1 mSv, which is
equivalent to about 10 days of natural background radiation. A dose of 0.01 mSv is lower than
typical, 1 mSv is more typical of a mammogram or a CT scan of the head, and 10 mSv is more typical
of a CT scan of the abdomen and pelvis. Chest radiography is one of the lowest-dose imaging studies.
Q7. A 60-year-old man is scheduled for a CT scan of the abdomen and pelvis. Which of the following
best describes the approximate effective dose of this study?
A. 0.1 mSv
B. 1 mSv
C. 10 mSv
D. 100 mSv
, Correct Answer: 10 mSv (C) ✓
Rationale: The effective dose of a CT scan of the abdomen and pelvis is approximately 10 mSv,
which is equivalent to about three years of natural background radiation or roughly 100 chest
radiographs. A dose of 0.1 mSv is typical of a chest radiograph, 1 mSv is typical of a mammogram,
and 100 mSv is a level associated with increased cancer risk. CT accounts for a significant portion of
medical radiation exposure.
Q8. A 28-year-old woman who is pregnant is referred for imaging of right lower quadrant pain. Which
of the following is the most appropriate initial imaging study?
A. CT of the abdomen and pelvis
B. Ultrasound of the abdomen and pelvis
C. Radiograph of the abdomen
D. MRI of the abdomen and pelvis
Correct Answer: Ultrasound of the abdomen and pelvis (B) ✓
Rationale: Ultrasound is the preferred initial imaging study in pregnant patients because it
uses sound waves rather than ionizing radiation and is safe for the fetus. CT and radiography involve
ionizing radiation, and MRI may be used if ultrasound is inconclusive, although it is generally avoided
in the first trimester. Ultrasound is effective for evaluating the gallbladder, kidneys, and appendix in
pregnancy. The most appropriate initial study is ultrasound.
Q9. A 42-year-old man is scheduled for an MRI. He has a cardiac pacemaker. Which of the following is
the most important consideration?
A. The pacemaker may be unsafe in the magnetic field
B. The pacemaker will improve image quality
C. The pacemaker will reduce scan time
D. The pacemaker will decrease radiation dose
Correct Answer: The pacemaker may be unsafe in the magnetic field (A) ✓
Rationale: Cardiac pacemakers may be unsafe in the magnetic field of an MRI because the
magnetic field can cause device malfunction, heating, or displacement. The pacemaker does not
improve image quality, reduce scan time, or decrease radiation dose. Patients should be screened for
implanted devices before MRI, and MRI-conditional devices may be safe under specific conditions.
The most important consideration is that the pacemaker may be unsafe.
Q10. A 38-year-old woman is scheduled for an MRI with gadolinium contrast. Which of the following
is the most important adverse effect to monitor?
Fundamentals 5th Edition
Comprehensive Test Bank by Herring.
FONT DIRECTIVE: Times New Roman, Font Size 14 (apply to all text when exporting to Word/PDF)
TABLE OF CONTENTS - PART 1 of 5
Chapter 1: Imaging Physics and Radiation Safety (Questions 1-25)
Chapter 2: Chest Radiology (Questions 26-50)
Chapter 3: Abdominal Radiology (Questions 51-75)
Chapter 4: Musculoskeletal Radiology (Questions 76-100)
CHAPTER 1: IMAGING PHYSICS AND RADIATION SAFETY
Q1. A 45-year-old man is scheduled for a computed tomography scan of the abdomen. Which of the
following best describes the primary physical principle underlying CT image formation?
A. Attenuation of x-rays by tissues
B. Reflection of sound waves
C. Precession of hydrogen protons
D. Emission of positrons
Correct Answer: Attenuation of x-rays by tissues (A) ✓
Rationale: Computed tomography uses x-rays that are attenuated to varying degrees as they
pass through tissues, and the transmitted x-rays are detected to reconstruct cross-sectional images.
Reflection of sound waves describes ultrasound, precession of hydrogen protons describes magnetic
resonance imaging, and emission of positrons describes positron emission tomography. The degree
of x-ray attenuation depends on tissue density and atomic number, which is the basis of CT image
contrast.
Q2. A 30-year-old woman is undergoing an magnetic resonance imaging of the brain. Which of the
following best describes the primary physical principle underlying MR image formation?
,A. Attenuation of x-rays
B. Precession of hydrogen protons in a magnetic field
C. Reflection of sound waves
D. Emission of gamma rays
Correct Answer: Precession of hydrogen protons in a magnetic field (B) ✓
Rationale: Magnetic resonance imaging relies on the behavior of hydrogen protons, which
precess in a strong magnetic field and emit radiofrequency signals when perturbed by a
radiofrequency pulse. Attenuation of x-rays describes radiography and CT, reflection of sound waves
describes ultrasound, and emission of gamma rays describes nuclear medicine. The signal intensity
depends on proton density and tissue relaxation properties, which generate image contrast.
Q3. A 55-year-old man is undergoing an ultrasound of the abdomen. Which of the following best
describes the primary physical principle underlying ultrasound image formation?
A. Attenuation of x-rays
B. Precession of hydrogen protons
C. Reflection of sound waves at tissue interfaces
D. Emission of positrons
Correct Answer: Reflection of sound waves at tissue interfaces (C) ✓
Rationale: Ultrasound imaging uses high-frequency sound waves that are reflected at
interfaces between tissues with different acoustic impedances, and the returning echoes are used to
generate images. Attenuation of x-rays describes radiography and CT, precession of hydrogen protons
describes MRI, and emission of positrons describes PET. The frequency of the transducer determines
resolution and penetration depth.
Q4. A 40-year-old woman is undergoing a positron emission tomography scan. Which of the
following best describes the primary physical principle underlying PET image formation?
A. Attenuation of x-rays
B. Precession of hydrogen protons
C. Reflection of sound waves
D. Detection of annihilation photons from positron emission
Correct Answer: Detection of annihilation photons from positron emission (D) ✓
Rationale: Positron emission tomography uses radiotracers that emit positrons, which
annihilate with electrons to produce two 511 keV photons emitted in opposite directions, and these
photons are detected to create images. Attenuation of x-rays describes radiography and CT,
,precession of hydrogen protons describes MRI, and reflection of sound waves describes ultrasound.
PET is used to assess metabolic activity, commonly with fluorodeoxyglucose.
Q5. A 50-year-old man is undergoing a radiograph of the chest. Which of the following best describes
the primary physical principle underlying radiographic image formation?
A. Differential attenuation of x-rays by tissues
B. Precession of hydrogen protons
C. Reflection of sound waves
D. Detection of annihilation photons
Correct Answer: Differential attenuation of x-rays by tissues (A) ✓
Rationale: Radiography uses x-rays that are differentially attenuated as they pass through
tissues, and the transmitted x-rays expose a detector to create a two-dimensional image. Precession
of hydrogen protons describes MRI, reflection of sound waves describes ultrasound, and detection of
annihilation photons describes PET. Dense structures such as bone attenuate more x-rays and appear
white, while air attenuates few and appears black.
Q6. A 35-year-old woman is concerned about radiation exposure from a chest radiograph. Which of
the following best describes the effective dose of a standard chest radiograph?
A. 0.01 mSv
B. 0.1 mSv
C. 1 mSv
D. 10 mSv
Correct Answer: 0.1 mSv (B) ✓
Rationale: The effective dose of a standard chest radiograph is approximately 0.1 mSv, which is
equivalent to about 10 days of natural background radiation. A dose of 0.01 mSv is lower than
typical, 1 mSv is more typical of a mammogram or a CT scan of the head, and 10 mSv is more typical
of a CT scan of the abdomen and pelvis. Chest radiography is one of the lowest-dose imaging studies.
Q7. A 60-year-old man is scheduled for a CT scan of the abdomen and pelvis. Which of the following
best describes the approximate effective dose of this study?
A. 0.1 mSv
B. 1 mSv
C. 10 mSv
D. 100 mSv
, Correct Answer: 10 mSv (C) ✓
Rationale: The effective dose of a CT scan of the abdomen and pelvis is approximately 10 mSv,
which is equivalent to about three years of natural background radiation or roughly 100 chest
radiographs. A dose of 0.1 mSv is typical of a chest radiograph, 1 mSv is typical of a mammogram,
and 100 mSv is a level associated with increased cancer risk. CT accounts for a significant portion of
medical radiation exposure.
Q8. A 28-year-old woman who is pregnant is referred for imaging of right lower quadrant pain. Which
of the following is the most appropriate initial imaging study?
A. CT of the abdomen and pelvis
B. Ultrasound of the abdomen and pelvis
C. Radiograph of the abdomen
D. MRI of the abdomen and pelvis
Correct Answer: Ultrasound of the abdomen and pelvis (B) ✓
Rationale: Ultrasound is the preferred initial imaging study in pregnant patients because it
uses sound waves rather than ionizing radiation and is safe for the fetus. CT and radiography involve
ionizing radiation, and MRI may be used if ultrasound is inconclusive, although it is generally avoided
in the first trimester. Ultrasound is effective for evaluating the gallbladder, kidneys, and appendix in
pregnancy. The most appropriate initial study is ultrasound.
Q9. A 42-year-old man is scheduled for an MRI. He has a cardiac pacemaker. Which of the following is
the most important consideration?
A. The pacemaker may be unsafe in the magnetic field
B. The pacemaker will improve image quality
C. The pacemaker will reduce scan time
D. The pacemaker will decrease radiation dose
Correct Answer: The pacemaker may be unsafe in the magnetic field (A) ✓
Rationale: Cardiac pacemakers may be unsafe in the magnetic field of an MRI because the
magnetic field can cause device malfunction, heating, or displacement. The pacemaker does not
improve image quality, reduce scan time, or decrease radiation dose. Patients should be screened for
implanted devices before MRI, and MRI-conditional devices may be safe under specific conditions.
The most important consideration is that the pacemaker may be unsafe.
Q10. A 38-year-old woman is scheduled for an MRI with gadolinium contrast. Which of the following
is the most important adverse effect to monitor?
